Constituents of Cultivated Mulberry Tree

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Abstract
From the ethyl acetate extract of the cultivated mulberry tree (Morus alba L.), two new flavonoid derivatives with a fused dihydrochalcone partial moiety were isolated, and named kuwanons K and L. The structures of kuwanons K and L were shown to be 1 and 2 respectively, on the basis of chemical and spectral data. Kuwanons K (1) and L (2) are regarded biogenetically as Diels-Alder adducts of a chalcone derivative and a dehydroprenylflavonoid derivative, and are the first example of a flavonoid derivative possessing a cyclohexene ring at a B ring of a flavonoid derivative. 1 Part XI: NOMURA, T., T. F>UKAI, Y. HANO and S. URANO: Planta Med. submitted. 2 A part of this work was presented at the 102th Annual Meeting of the Pharmaceutical Society of Japan, Osaka, April, 1982.